EP0489551A2 - Loudspeaker system having multiple subchambers - Google Patents

Loudspeaker system having multiple subchambers Download PDF

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Publication number
EP0489551A2
EP0489551A2 EP91311100A EP91311100A EP0489551A2 EP 0489551 A2 EP0489551 A2 EP 0489551A2 EP 91311100 A EP91311100 A EP 91311100A EP 91311100 A EP91311100 A EP 91311100A EP 0489551 A2 EP0489551 A2 EP 0489551A2
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EP
European Patent Office
Prior art keywords
subchambers
subchamber
passive radiator
loudspeaker system
acoustic
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EP91311100A
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German (de)
French (fr)
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EP0489551B1 (en
EP0489551A3 (en
Inventor
William P. c/o Bose Corporation Schreiber
Gerald F. c/o Bose Corporation Caron
Brian J. c/o Bose Corporation Gawronski
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Bose Corp
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Bose Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2842Enclosures comprising vibrating or resonating arrangements of the bandpass type for loudspeaker transducers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/227Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  using transducers reproducing the same frequency band
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807Enclosures comprising vibrating or resonating arrangements
    • H04R1/283Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
    • H04R1/2834Enclosures comprising vibrating or resonating arrangements using a passive diaphragm for loudspeaker transducers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2807Enclosures comprising vibrating or resonating arrangements
    • H04R1/2838Enclosures comprising vibrating or resonating arrangements of the bandpass type
    • H04R1/2846Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material
    • H04R1/2849Vents, i.e. ports, e.g. shape thereof or tuning thereof with damping material for loudspeaker transducers

Definitions

  • the present invention relates to loudspeaker systems having multiple subchambers and passive radiators, such as ports and drone cones.
  • These systems comprise an acoustic source so coupled to a series of higher order acoustic filters as to produce an acoustic output which is frequency band limited and whose acoustic power output in that band is generally constant as a function of frequency.
  • the series of acoustic filters are typically embodied as acoustic compliances (enclosed volumes of air) and acoustic masses (passive radiators or ports).
  • inventions may be used in any acoustic application where a bandpass output is desired, where low distortion is desired, where high output is desired, and/or where economically configured transducers are desired.
  • Their uses include, but are not limited to, bass boxes for musical instruments, permanently installed sound systems for homes or auditoria, and for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • distortion components generated by the speaker system are generally higher in frequency than the specified frequency. If the specified frequency is in the bass region, these higher frequency distortion components make it easier for the listener to detect the speaker system location. In addition, most distortion has multiple frequency components resulting in a wideband distortion spectrum which gives multiple (positively interacting) clues to the listener as to the speaker system location. Because of the lower distortion generated by embodiments of this invention compared to prior art, these embodiments are more useful as nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • internal subchambers may be connected via passive radiator means not only to other subchambers but, in addition, to the region outside the enclosure. For a desired flat frequency response output, this may result in somewhat different volume and acoustic mass ratios for each configuration.
  • various internal subchambers may be connected by passive radiator means to only one other subchamber and not directly coupled to the region outside the enclosure. For a desired flat frequency response output, this may result in somewhat different volume and acoustic mass ratios for each configuration.
  • Bose U.S. Patent No. 4,549,631 incorporated herein by reference. This patent discloses an enclosure divided into ported subchambers by a baffle carrying a loudspeaker driver.
  • an enclosure with a first dividing wall supporting one or more electroacoustical transducers and separating first and second subchambers. These first and second subchambers are each separated from subsequent subchambers by dividing walls containing passive radiators, such as port means or drone cones, to couple these subchambers to one another or to the region outside the enclosure. At least one subchamber has an exterior wall which carries passive radiator means to couple the acoustic energy of the loudspeaker system with the region outside the enclosure.
  • FIGS. 1 and 2 there are shown a perspective pictorial view and a simplified cross section thereof, respectively, of an embodiment of the invention.
  • a second dividing wall 11 separates the first internal subchamber V1 from a third subchamber V3 and carries a passive radiator means P1 intercoupling the first internal V1 and third V3 subchambers.
  • the second V2 and third V3 subchambers each has an exterior wall which carries a passive radiator or port means P2 and P3, respectively, for radiating acoustic energy to the region outside the enclosure.
  • Woofer loudspeaker drivers 12 are mounted on first dividing wall 13 that separates the first internal subchamber V1 from the second subchamber V2.
  • FIG. 3 there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 1 and 2. There follows representative parameter values.
  • FIG. 4 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; a prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and the embodiment of FIGS. 1-3 by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response.
  • the embodiment of FIGS. 1-3 provides improved output in the bass region and a sharper cutoff at higher frequencies than the other enclosures.
  • FIG. 5 there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D.
  • Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency.
  • a prior art ported system has one port resonance where the cone excursion is minimized.
  • the two-subchamber system according to prior art (per Bose patent No. 4,541,631) has two passband resonances where the cone excursion can be minimized.
  • Curve D shows that the three subchamber configuration according to this invention has three such resonances where the cone excursion is minimized.
  • the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration.
  • FIG. 6 there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention.
  • the added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • a second dividing wall 11′ separates both the first V1′ and second V2′ internal subchambers from a third subchamber V3′ and carries two passive radiator means P1′ and P2′ each intercoupling the first internal and third subchambers and the second internal and third subchambers, respectively.
  • the third subchamber V3′ has an exterior wall which carries a passive radiator or port means P3′ for radiating acoustic energy to the region outside the enclosure.
  • FIG. 9 there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 7 and 8. There follows typical parameter values for this embodiment.
  • FIG. 10 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response.
  • This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of the prior art enclosures.
  • FIG. 11 there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D.
  • Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency.
  • Curve D shows that the three subchamber configuration according to this invention has three passband resonances where the cone excursion is minimized.
  • the range of system enclosure parameters for this embodiment that may produce the flat response and benefits described above are: 1 ⁇ V2 V1 ⁇ 5 0.25 ⁇ V3 V2 + V1 1.2 ⁇ C2 C1 2 ⁇ C1 + C2 C3
  • FIG. 11A there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention.
  • the added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • a second driving wall 11 ⁇ separates both the first internal subchamber V1 ⁇ from a third subchamber V3 ⁇ and carries a passive radiator means P1 ⁇ intercoupling the first internal and third subchambers.
  • a third dividing wall 14 ⁇ separates the second internal subchamber from a fourth subchamber, and carries a passive radiator means intercoupling the second internal and fourth subchambers.
  • the third and fourth subchambers each has an exterior wall which carries a passive radiator or port means P3 ⁇ and P4 ⁇ , respectively, for radiating acoustic energy to the region outside the enclosure.
  • FIG. 14 there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 12 and 13. Exemplary parameter values follow:
  • FIGS. 15, 16 and 17 Advantages of this four-subchamber configuration are shown in FIGS. 15, 16 and 17.
  • FIG. 15 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response.
  • This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • FIG. 16 there is shown a graphical representation of cone displacement as a function of frequency for prior art acoustic suspension system, in curve A, and according to the invention, in curve D.
  • Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency.
  • Curve D shows that the four-subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration.
  • FIG. 17 there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention.
  • the added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • a second dividing wall 11′ ⁇ separates both the first V1′ ⁇ and second V2′ ⁇ internal subchambers from a third internal subchamber V3′ ⁇ and carries two passive radiator means P1′ ⁇ and P2′ ⁇ each intercoupling the first internal and third internal subchambers and the second internal and third internal subchambers, respectively.
  • a third dividing wall 14"' separates the third internal subchamber V3′ ⁇ from a fourth subchamber V4′ ⁇ , and carries a passive radiator means P3′ ⁇ intercoupling the third internal and fourth subchambers.
  • the fourth subchamber V4′ ⁇ has an exterior wall which carries a passive radiator or port means P4′ ⁇ for radiating acoustic energy to the region outside the enclosure.
  • FIG. 20 there is shown an electrical circuit analog circuit diagram of the embodiment of FIGS. 18 and 19. Exemplary parameter values for this embodiment follow:
  • FIGS. 21-23 Advantages of this four-subchamber configuration are shown in FIGS. 21-23.
  • FIG. 21 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response.
  • This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • FIG. 22 there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D.
  • Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency.
  • Curve D shows that the four- subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration.
  • FIG. 23 there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention.
  • the added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • FIGS. 24 and 25 there are shown perspective pictorial and simplified cross-section views of another embodiment of the invention.
  • a second dividing wall 11 ⁇ ⁇ separates the first internal subchamber V1 ⁇ ⁇ from a third internal subchamber V3 ⁇ ⁇ and carries a passive radiator means P1 ⁇ ⁇ intercoupling the first internal and third internal subchambers.
  • a third dividing wall 14 ⁇ ⁇ separates the first V1 ⁇ ⁇ , the second V2 ⁇ ⁇ and third V3 ⁇ ⁇ subchambers from a fourth subchamber V4 ⁇ ⁇ , and carries two passive radiator means P2 ⁇ ⁇ and P3 ⁇ ⁇ intercoupling the second internal and fourth subchambers and the third internal and fourth subchambers, respectively.
  • the fourth subchamber V4 ⁇ ⁇ has an exterior wall which carries a passive radiator or port means P4 ⁇ ⁇ for radiating acoustic energy to the region outside the enclosure.
  • FIG. 26 there is shown an electrical circuit analog schematic circuit diagram of the embodiment of FIGS. 24 and 25. Exemplary parameter values follow:
  • FIG. 27 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response.
  • This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • FIG. 28 there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D.
  • Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency.
  • Curve D shows that the four-subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration.
  • FIG. 29 there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention.
  • the added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • second dividing wall 11 v separates the first internal subchamber V1 v from a third internal subchamber V3 v and carries a passive radiator means P1 v intercoupling the first internal and third internal subchambers.
  • a third dividing wall 14 v separates the third internal subchamber V3 v from a fourth subchamber V4 v and carries a passive radiator means P3 v intercoupling the third internal and fourth subchambers.
  • the second and fourth subchambers each has an exterior wall which carries a passive radiator or port means P2 v and P4 v , respectively, for radiating acousticenergy to the region outside the enclosure.
  • FIG. 32 there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 30 and 31. There follows exemplary parameter values for this embodiment.
  • FIGS. 33-35 Advantages of this four-subchamber configuration are shown in FIGS. 33-35.
  • FIG. 33 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response.
  • This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • FIG. 34 there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D.
  • Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency.
  • Curve D shows that the four-subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration.
  • FIG. 35 there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention.
  • the added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • FIG. 36 there is shown a pictorial perspective view of a commercial embodiment of the invention that is a variation of the embodiment of FIGS. 7-11A.
  • This embodiment of the invention includes a pair of woofers 12 mounted on intermediate panel 13 vi .
  • Intermediate panels 11 vi and 13 vi bound intermediate subchamber V1 vi .
  • Intermediate panels 13 vi and 11 vi bound end subchambers V3 vi and V2 vi , respectively.
  • Passive radiator P1 vi intercouples end subchambers V2 vi and V3 vi .
  • Passive radiator P2 vi intercouples intermediate subchamber V 1 vi and end subchamber V3 vi .
  • Flared port tube passive radiator P3 vi couples end subchamber V3 vi with the region outside the enclosure.
  • FIG. 37 there is shown a simplified cross section of the embodiment of FIG. 36.
  • This embodiment of the invention is embodied in the commercial ACOUSTIMASS®-5 series II bass module being manufactured and sold by the assignee of this application.
  • This commercial embodiment has the following representative parameters: Volume of intermediate subchamber V1 vi .00413m3 Volume of end subchamber V2 vi .00657m3 Volume of end subchamber V3 vi .0119m3
  • the ellipse has a major diameter substantially equal to the length of the tube.
  • the woofers are 14cm diameter woofers. These parameters produce three deflection minima at 44 Hz, 80 Hz and 190 Hz and provide the frequency response characteristic shown in FIG. 38 having a relatively uniform response over the bass frequency range and a sharp cutoff at 30 db per octave above 200 Hz to sharply reduce the radiation of undesired harmonics through flared port P3 vi .
  • flared port tube P3 vi helps avoid nonlaminar airflow to the region outside the enclosure that might produce audible noise when radiating at high pressure levels.
  • the volumes of end subchambers V1 vi and V3 vi are unequal and greater than the volume of intermediate subchamber V2 vi .
  • Port tubes P2 vi are symmetrical about port tube P1 to provide equal acoustic loading to each of the two woofers. Having the end chambers coupled by the port tube through the intermediate subchamber facilitates manufacture and helps achieve a desired performance level with a thinner enclosure. Having one end of each port tube flush with a supporting intermediate wall increases the effective acoustic mass for a given port tube length.
  • An advantage of the invention is that with at least three spaced deflection minima within the passband, diaphragm displacement to produce a prescribed sound level is reduced. This feature allows use of smaller woofers that may be supported upon a relatively small baffle parallel and perpendicular to enclosure sides in an enclosure of the same volume as a prior art enclosure having larger woofers mounted on a slanted baffle.
  • a first cylindrical structure 101 defines subchambers 101A and 101B separated by an internal circular baffle 102 carrying woofer 103 with end port tubes 104 and 105.
  • Cylindrical structure 101 may then be placed through the circular opening of port 112 in cylindrical structure 111 to define another subchamber formed by the region between cylindrical structure 101 and the contiguous cylindrical region of structure 111.
  • Cylindrical structure 121 may then similarly accommodate nested structures 101 and 111 through port 122 to define still another subchamber surrounding cylindrical structures 101 and 111 and partially cylindrical. It is within the principles of the invention to form similar nesting structures of elliptical, triangular, square or other cross sections. Applying this nesting principle allows for implementing a modular building-block approach to forming enclosures, whereby a selected level of bass response may be achieved by adding completely passive subchambers to one or more basic drive units.
  • FIGS. 40A and 40B there are shown shipping and use positions, respectively, of a variation of the embodiment of FIG. 39. Applying this nesting principle allows for making a compact portable bass system, whereby the larger, outer subchamber collapsed serve as a carrying case during transport of shipment as shown in FIG. 40A, but can be extended to define a subchamber of larger volume for better bass reproduction as shown in FIG. 40B.

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  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Headphones And Earphones (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

A loudspeaker system has at least a first electroacoustical transducer ( 12 ) having a vibratable diaphragm for converting an input electrical signal into a corresponding acoustic output signal. An enclosure is divided into at least first, second and third subchambers (V₁,V₂,V₃) by at least first (13) and second (11) dividing walls. The first dividing wall (13) supports and coacts with the first electrical transducer (12) to bound the first and second subchambers (V₁,V₂). At least a first passive radiator (P₁) intercouples the first and third subchambers. At least a second passive radiator (P₂) intercouples at least one of the second and third subchambers with the region outside the enclosure. Each passive radiator (P₁,P₂) has an acoustic mass and each subchamber (V₁, V₂, V₃) has an acoustic compliance. The acoustic masses and acoustic compliances coact to establish at least three spaced frequencies in the passband of the loudspeaker system at which the deflection characteristic of the vibratable diaphragm as a function of frequency has a minimum.

Description

  • The present invention relates to loudspeaker systems having multiple subchambers and passive radiators, such as ports and drone cones. These systems comprise an acoustic source so coupled to a series of higher order acoustic filters as to produce an acoustic output which is frequency band limited and whose acoustic power output in that band is generally constant as a function of frequency. The series of acoustic filters are typically embodied as acoustic compliances (enclosed volumes of air) and acoustic masses (passive radiators or ports).
  • For background reference is made to Bose U.S. Patent No. 4,549,631 and the dual chamber systems described by Earl R. Geddes in his May 1989 article in the Journal of the Audio Engineering Society "An introduction to Band-Pass Loudspeaker Systems," which discloses using components to achieve higher order rolloffs of high frequencies.
  • All embodiments of the invention have the following advantages:
    • 1. Relatively low average cone excursion in the bandpass region, i.e., relatively low distortion for large signal output for a given transducer size.
    • 2. Relatively high output in this bandpass region for a given enclosure volume.
    • 3. The use of common, practical, economically configured transducers as the drive units.
    • 4. Relatively higher order rolloff of high frequencies.
    • 5. Achieving the bandpass characteristic without external electrical elements, resulting in relatively low cost, relatively high performance and relatively high reliability.
    • 6. A transient response which is delayed in time by up to or greater than 10 milliseconds.
  • These embodiments may be used in any acoustic application where a bandpass output is desired, where low distortion is desired, where high output is desired, and/or where economically configured transducers are desired. Their uses include, but are not limited to, bass boxes for musical instruments, permanently installed sound systems for homes or auditoria, and for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • For any speaker system driven at high input electrical signal at a specified frequency, distortion components generated by the speaker system are generally higher in frequency than the specified frequency. If the specified frequency is in the bass region, these higher frequency distortion components make it easier for the listener to detect the speaker system location. In addition, most distortion has multiple frequency components resulting in a wideband distortion spectrum which gives multiple (positively interacting) clues to the listener as to the speaker system location. Because of the lower distortion generated by embodiments of this invention compared to prior art, these embodiments are more useful as nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • The higher order rolloff (≧ 18 dB/octave) of high frequencies for embodiments of this invention enhances its nonlocalizability. On complex signals (music or speech), the listener will receive significant directional cues only from the higher frequency components of the speaker system. Thus, these embodiments are more useful than prior art as nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Experiments performed by K. deBoer, Haas, Wallach, and others indicate that a listener's ability to correctly locate sources of sounds depends on the relative time difference of the sounds coming from those sources. If spectrally identical sounds are produced by two sources spaced a few meters apart, but one source produces the sound a few milliseconds later than the other, the listener will ignore the later source and identify the earlier source as the sole producer of both sounds (Precedence Effect). Embodiments of this invention produce a greater time delay than prior art and thus are more useful for providing nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Although all these exemplary configurations and volume and acoustic mass ratios describe embodiments whose acoustic power output is generally flat with frequency in the passband, this may not be the desired shape in certain applications, such as applications where the electrical input signal is equalized with frequency. For any desired frequency contour, a similar set of volume and acoustic mass ratios may be worked out for each configuration.
  • In addition, as variations of the basic embodiments described herein, internal subchambers may be connected via passive radiator means not only to other subchambers but, in addition, to the region outside the enclosure. For a desired flat frequency response output, this may result in somewhat different volume and acoustic mass ratios for each configuration.
  • In addition, as variations of the basic embodiments described herein, various internal subchambers may be connected by passive radiator means to only one other subchamber and not directly coupled to the region outside the enclosure. For a desired flat frequency response output, this may result in somewhat different volume and acoustic mass ratios for each configuration.
  • For background reference is made to Bose U.S. Patent No. 4,549,631 incorporated herein by reference. This patent discloses an enclosure divided into ported subchambers by a baffle carrying a loudspeaker driver.
  • According to the invention, there is an enclosure with a first dividing wall supporting one or more electroacoustical transducers and separating first and second subchambers. These first and second subchambers are each separated from subsequent subchambers by dividing walls containing passive radiators, such as port means or drone cones, to couple these subchambers to one another or to the region outside the enclosure. At least one subchamber has an exterior wall which carries passive radiator means to couple the acoustic energy of the loudspeaker system with the region outside the enclosure.
  • Numerous other features, objects and advantages of the invention will become apparent from the following detailed description when read in connection with the accompanying drawings in which:
    • FIG. 1 is a perspective pictorial representation of an exemplary embodiment of the invention;
    • FIG. 2 is a simplified cross section of the embodiment of FIG. 1;
    • FIG. 3 is an electrical circuit analog of the embodiment of FIGS. 1 and 2;
    • FIG. 4 shows the radiated acoustic output power as a function of frequency of the embodiment of FIGS. 1-3 compared with other enclosures;
    • FIG. 5 is a graphical representation of diaphragm excursion as a function of frequency of the embodiment of FIGS. 1-3 compared with that of an acoustic suspension enclosure;
    • FIG. 6 is a graphical representation of the transient response of the embodiment of FIGS. 1-3 compared with that of an acoustic suspension enclosure;
    • FIG. 7 is a pictorial perspective view of another embodiment of the invention;
    • FIG. 8 is a simplified cross section of the embodiment of FIG. 7;
    • FIG. 9 is a schematic electrical circuit analog diagram of the embodiment of FIGS. 7 and 8;
    • FIG. 10 is the output power frequency response of the embodiment of FIGS. 7-9 compared with other enclosures;
    • FIG. 11 shows diaphragm displacement as a function of frequency of the embodiment of FIGS. 7-9 compared with that of an acoustic suspension enclosure;
    • FIG. 11A is a graphical representation of the transient response of the embodiment of FIGS. 7-9 compared with that of an acoustic suspension enclosure;
    • FIG. 12 is a pictorial perspective view of another embodiment of the invention;
    • FIG. 13 is a simplified cross section of the embodiment of FIG. 12;
    • FIG. 14 is a schematic electrical circuit analog diagram of the embodiment of FIGS. 11-13;
    • FIG. 15 is the output power frequency response of the embodiment of FIGS. 12-14 compared with the responses of other enclosures;
    • FIG. 16 is a graphical representation of diaphram displacement as a function of frequency for the embodiment of FIGS. 12-14 compared with that of an acoustic suspension enclosure;
    • FIG. 17 is a graphical representation of the transient response of the embodiment of FIGS. 12-14 compared with that of an acoustic suspension enclosure;
    • FIG. 18 is a perspective pictorial view of another embodiment of the invention;
    • FIG. 19 is a simplified cross section of the embodiment of FIG. 18;
    • FIG. 20 is a schematic electrical circuit analog diagram of the embodiment of FIGS. 18 and 19;
    • FIG. 21 is the output power frequency response of the embodiment of FIGS. 18-20 compared with other enclosures;
    • FIG. 22 is a graphical representation of diaphram displacement as a function of frequency for the embodiment of FIGS. 18-20 compared with that of an acoustic suspension enclosure;
    • FIG. 23 is a graphical representation of the transient response of the embodiment of FIGS. 18-20 compared with that of an acoustic suspension enclosure;
    • FIG. 24 is a perspective pictorial view of another embodiment of the invention;
    • FIG. 25 is a simplified cross section of the embodiment of FIG. 24;
    • FIG. 26 is a schematic electrical circuit analog diagram of the embodiment of FIGS. 24 and 25;
    • FIG. 27 is the output power frequency response of the embodiment of FIGS. 24-26 compared with that of other enclosures;
    • FIG. 28 is a graphical representation of diaphram displacement of the embodiment of FIGS. 24-26 compared with an acoustic suspension enclosure;
    • FIG. 29 is a graphical representation of the transient response of the embodiment of FIGS. 24-26 compared with that of an acoustic suspension enclosure;
    • FIG. 30 is a perspective pictorial view of another embodiment of the invention;
    • FIG. 31 is a simplified cross section of the embodiment of FIG. 30;
    • FIG. 32 is a schematic electrical circuit analog diagram of the embodiment of FIGS. 30 and 31;
    • FIG. 33 is the output power frequency response of the embodiment of FIGS. 30-32 compared with that of other enclosures;
    • FIG. 34 is a graphical representation of diaphram displacement as a function of frequency for the embodiment of FIGS. 30-32 compared with that of an acoustic suspension enclosure;
    • FIG. 35 is a graphical representation of the transient response of the embodiment of FIGS. 30-32 compared with that of an acoustic suspension enclosure;
    • FIG. 36 is a perspective pictorial view of a commercial embodiment of the invention;
    • FIG. 37 is a simplified cross section of the embodiment of FIG. 36;
    • FIG. 38 is a graphical representation of the frequency response of the commercial embodiment of FIGS. 36 and 37;
    • FIG. 39 is a pictorial representation of another embodiment of the invention comprising nesting cylindrical structures; and
    • FIGS. 40A and 40B show shipping and use positions, respectively, of a variation of the embodiment of FIG. 39.
  • With reference now to the drawings, the description of most embodiments includes:
    • 1) a physical description of that embodiment;
    • 2) a drawing of that embodiment;
    • 3) an electrical circuit analog of that embodiment;
    • 4) parameter values for a typical configuration of that embodiment;
    • 5) performance parameters for the typical configuration of (4); e.g., radiated power and cone displacement as functions of frequency;
    • 6) a description of the advantages of the embodiment; and
    • 7) a range of volume and passive radiator acoustic mass ratios which produce a frequency power response which is generally constant with frequency over the band pass range of frequencies.
  • Referring to FIGS. 1 and 2, there are shown a perspective pictorial view and a simplified cross section thereof, respectively, of an embodiment of the invention. In this embodiment, a second dividing wall 11 separates the first internal subchamber V1 from a third subchamber V3 and carries a passive radiator means P1 intercoupling the first internal V1 and third V3 subchambers. The second V2 and third V3 subchambers each has an exterior wall which carries a passive radiator or port means P2 and P3, respectively, for radiating acoustic energy to the region outside the enclosure.
  • Woofer loudspeaker drivers 12 are mounted on first dividing wall 13 that separates the first internal subchamber V1 from the second subchamber V2.
  • Referring to FIG. 3, there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 1 and 2. There follows representative parameter values.
    Figure imgb0001
  • Referring to FIG. 4, there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; a prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and the embodiment of FIGS. 1-3 by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response. The embodiment of FIGS. 1-3 provides improved output in the bass region and a sharper cutoff at higher frequencies than the other enclosures.
  • Referring to FIG. 5, there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D. Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency. A prior art ported system has one port resonance where the cone excursion is minimized. The two-subchamber system according to prior art (per Bose patent No. 4,541,631) has two passband resonances where the cone excursion can be minimized. Curve D shows that the three subchamber configuration according to this invention has three such resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration. The range of system enclosure parameters for the embodiment of FIGS. 1-3 that may produce the flat response and benefits described above are: 1 ≦ V3 V1
    Figure imgb0002
    0.6 ≦ V2 V1 + V3
    Figure imgb0003
    0.5 ≦ C1 C3 ≦ 4
    Figure imgb0004
    0.5 ≦ C2 C1 + C3 ≦ 4
    Figure imgb0005
  • Referring to FIG. 6, there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention. The added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Referring to FIGS. 7 and 8, there are shown pictorial perspective and simplified cross-section views, respectively, of another embodiment of the invention. In this embodiment, a second dividing wall 11′ separates both the first V1′ and second V2′ internal subchambers from a third subchamber V3′ and carries two passive radiator means P1′ and P2′ each intercoupling the first internal and third subchambers and the second internal and third subchambers, respectively. The third subchamber V3′ has an exterior wall which carries a passive radiator or port means P3′ for radiating acoustic energy to the region outside the enclosure.
  • Referring to FIG. 9, there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 7 and 8. There follows typical parameter values for this embodiment.
    Figure imgb0006
    Figure imgb0007
  • Referring to FIG. 10 there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response. This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of the prior art enclosures.
  • Referring to FIG. 11, there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D. Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency. Curve D shows that the three subchamber configuration according to this invention has three passband resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration. The range of system enclosure parameters for this embodiment that may produce the flat response and benefits described above are: 1 ≦ V2 V1 ≦ 5
    Figure imgb0008
    0.25 ≦ V3 V2 + V1
    Figure imgb0009
    1.2 ≦ C2 C1
    Figure imgb0010
    2 ≦ C1 + C2 C3
    Figure imgb0011
  • Referring to FIG. 11A, there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention. The added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Referring to FIGS. 12 and 13, there are shown pictorial perspective and simplified cross section views of another embodiment of the invention. In this embodiment, a second driving wall 11˝ separates both the first internal subchamber V1˝ from a third subchamber V3˝ and carries a passive radiator means P1˝ intercoupling the first internal and third subchambers. A third dividing wall 14˝ separates the second internal subchamber from a fourth subchamber, and carries a passive radiator means intercoupling the second internal and fourth subchambers. The third and fourth subchambers each has an exterior wall which carries a passive radiator or port means P3˝ and P4˝, respectively, for radiating acoustic energy to the region outside the enclosure.
  • Referring to FIG. 14, there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 12 and 13. Exemplary parameter values follow:
    Figure imgb0012
    Figure imgb0013
  • Advantages of this four-subchamber configuration are shown in FIGS. 15, 16 and 17.
  • Referring to FIG. 15, there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response. This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • Referring to FIG. 16, there is shown a graphical representation of cone displacement as a function of frequency for prior art acoustic suspension system, in curve A, and according to the invention, in curve D. Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency. Curve D shows that the four-subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration. The range of system enclosure parameters for this embodiment that may produce the flat response and benefits described above are: 1.5 ≦ V3 V1
    Figure imgb0014
    1.5 ≦ V4 V2
    Figure imgb0015
    1 ≦ V2 + V4 V1 + V3 ≦ 4
    Figure imgb0016
    0.8 ≦ C4 C2
    Figure imgb0017
    C3 C1 ≦ 1
    Figure imgb0018
    0.8 ≦ C2 + C4 C1 + C3
    Figure imgb0019
  • Referring to FIG. 17, there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention. The added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Referring to FIGS. 18 and 19, there are shown pictorial perspective and simplified cross-section views of another embodiment of the invention. In this embodiment, a second dividing wall 11′˝ separates both the first V1′˝ and second V2′˝ internal subchambers from a third internal subchamber V3′˝ and carries two passive radiator means P1′˝ and P2′˝ each intercoupling the first internal and third internal subchambers and the second internal and third internal subchambers, respectively. A third dividing wall 14"' separates the third internal subchamber V3′˝ from a fourth subchamber V4′˝, and carries a passive radiator means P3′˝ intercoupling the third internal and fourth subchambers. The fourth subchamber V4′˝ has an exterior wall which carries a passive radiator or port means P4′˝ for radiating acoustic energy to the region outside the enclosure.
  • Referring to FIG. 20, there is shown an electrical circuit analog circuit diagram of the embodiment of FIGS. 18 and 19. Exemplary parameter values for this embodiment follow:
    Figure imgb0020
    Figure imgb0021
  • Advantages of this four-subchamber configuration are shown in FIGS. 21-23.
  • Referring to FIG. 21, there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response. This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • Referring to FIG. 22, there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D. Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency. Curve D shows that the four- subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration. The range of system enclosure parameters for this embodiment that may produce the flat response and benefits described above: 1.5 ≦ V2 V1
    Figure imgb0022
    0.8 ≦ V4 V3 ≦ 4
    Figure imgb0023
    1.5 ≦ V3 + V4 V1 + V2
    Figure imgb0024
    2 ≦ C2 C1
    Figure imgb0025
    0.5 ≦ C4 C3 ≦ 3
    Figure imgb0026
    2 ≦ C1 + C2 C3 + C4
    Figure imgb0027
  • Referring to FIG. 23, there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention. The added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Referring to FIGS. 24 and 25, there are shown perspective pictorial and simplified cross-section views of another embodiment of the invention. In this embodiment, a second dividing wall 11˝˝ separates the first internal subchamber V1˝˝ from a third internal subchamber V3˝˝ and carries a passive radiator means P1˝˝ intercoupling the first internal and third internal subchambers. A third dividing wall 14˝˝ separates the first V1˝˝, the second V2˝˝ and third V3˝˝ subchambers from a fourth subchamber V4˝˝, and carries two passive radiator means P2˝˝ and P3˝˝ intercoupling the second internal and fourth subchambers and the third internal and fourth subchambers, respectively. The fourth subchamber V4˝˝ has an exterior wall which carries a passive radiator or port means P4˝˝ for radiating acoustic energy to the region outside the enclosure.
  • Referring to FIG. 26, there is shown an electrical circuit analog schematic circuit diagram of the embodiment of FIGS. 24 and 25. Exemplary parameter values follow:
    Figure imgb0028
    Figure imgb0029
  • Referring to FIG. 27, there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response. This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • Referring to FIG. 28, there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D. Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency. Curve D shows that the four-subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration. The range of system enclosure parameters for this embodiment that may produce the flat responses and benefits described above are: 1.5 ≦ V3 V1
    Figure imgb0030
    0.5 ≦ V2 V1 + V3 2
    Figure imgb0031
    0.5 ≦ V4 V1+V2+V3 ≦ 2
    Figure imgb0032
    1.5 ≦ C1 C3 ≦ 6
    Figure imgb0033
    1 ≦ C2 C1 + C3 ≦ 4
    Figure imgb0034
    4 ≦ C1+C2+C3 C4
    Figure imgb0035
  • Referring to FIG. 29, there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention. The added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Referring to FIGS. 30 and 31, there are shown pictorial perspective and simplified cross-section views of another embodiment of the invention. In this embodiment, second dividing wall 11 v separates the first internal subchamber V1 v from a third internal subchamber V3 v and carries a passive radiator means P1 v intercoupling the first internal and third internal subchambers. A third dividing wall 14 v separates the third internal subchamber V3 v from a fourth subchamber V4 v and carries a passive radiator means P3 v intercoupling the third internal and fourth subchambers. The second and fourth subchambers each has an exterior wall which carries a passive radiator or port means P2 v and P4 v , respectively, for radiating acousticenergy to the region outside the enclosure.
  • Referring to FIG. 32, there is shown an electrical circuit analog schematic diagram of the embodiment of FIGS. 30 and 31. There follows exemplary parameter values for this embodiment.
    Figure imgb0036
    Figure imgb0037
  • Advantages of this four-subchamber configuration are shown in FIGS. 33-35.
  • Referring to FIG. 33, there is shown the acoustic power radiated by an acoustic suspension system as a function of frequency by curve A; a prior art ported system, by curve B; prior art (per Bose Patent No. 4,549,631) dual ported system, by curve C; and this configuration, by curve D.
  • Each system has the same size woofer and the same total enclosure volume with the loudspeaker and port parameters having been appropriately optimized for each system by adjusting that system's elements to achieve flat frequency response. This configuration provides improved output in the bass region and a sharper cutoff at higher frequencies than any of these prior art enclosures.
  • Referring to FIG. 34, there is shown a graphical representation of cone displacement as a function of frequency for a prior art acoustic suspension system, in curve A, and according to the invention, in curve D. Curve A shows that the cone excursion of the acoustic suspension speaker rises with decreasing frequency. Curve D shows that the four-subchamber configuration according to this invention has four resonances where the cone excursion is minimized. Thus, the overall cone excursion and thus, distortion, on bass frequency signals is lower in this configuration.
  • The range of system enclosure parameters for this embodiment that may produce the flat response and benefits described above are: 1.5 ≦ V3 V1
    Figure imgb0038
    1.5 ≦ V4 V3
    Figure imgb0039
    0.5 ≦ V1+V3+V4 V2 ≦ 3
    Figure imgb0040
    0.8 ≦ C1 C3 ≦ 4
    Figure imgb0041
    0.8 ≦ C3 C4 ≦ 4
    Figure imgb0042
    0.5 ≦ C1+C3+C4 C2 ≦ 3
    Figure imgb0043
  • Referring to FIG. 35, there is shown a graphical representation of impulse transient response of a prior art acoustic suspension system and the impulse transient response of the invention. The added time delay in the reproduction of the signal is particularly useful for nonlocalizable bass output components in multiple speaker configurations in which the desired sonic imaging is to be controlled by the higher frequency components of those multiple speaker configurations.
  • Referring to FIG. 36, there is shown a pictorial perspective view of a commercial embodiment of the invention that is a variation of the embodiment of FIGS. 7-11A. This embodiment of the invention includes a pair of woofers 12 mounted on intermediate panel 13vi. Intermediate panels 11vi and 13vi bound intermediate subchamber V₁vi. Intermediate panels 13vi and 11vi bound end subchambers V₃vi and V₂vi, respectively. Passive radiator P₁vi intercouples end subchambers V₂vi and V₃vi. Passive radiator P₂vi intercouples intermediate subchamber V vi and end subchamber V₃vi. Flared port tube passive radiator P₃vi couples end subchamber V₃vi with the region outside the enclosure.
  • Referring to FIG. 37, there is shown a simplified cross section of the embodiment of FIG. 36.
  • This embodiment of the invention is embodied in the commercial ACOUSTIMASS®-5 series II bass module being manufactured and sold by the assignee of this application. This commercial embodiment has the following representative parameters:
       Volume of intermediate subchamber V₁vi .00413m³
       Volume of end subchamber V₂vi .00657m³
       Volume of end subchamber V₃vi .0119m³
       Port tube passive radiator P₁vi .203m long by .044m in diameter.
       Port tubes passive radiator P₂vi each .057m long by .051m in diameter.
  • Flared port tube passive radiator P₃vi .12m long by .12m in diameter at each end and .058m in diameter at the center bounded by the inside of a toroid of elliptical cross section. The ellipse has a major diameter substantially equal to the length of the tube.
  • The woofers are 14cm diameter woofers. These parameters produce three deflection minima at 44 Hz, 80 Hz and 190 Hz and provide the frequency response characteristic shown in FIG. 38 having a relatively uniform response over the bass frequency range and a sharp cutoff at 30 db per octave above 200 Hz to sharply reduce the radiation of undesired harmonics through flared port P₃vi.
  • The tapered cross section of flared port tube P₃vi helps avoid nonlaminar airflow to the region outside the enclosure that might produce audible noise when radiating at high pressure levels.
  • In this specific embodiment the volumes of end subchambers V₁vi and V₃vi are unequal and greater than the volume of intermediate subchamber V₂vi. Port tubes P₂vi are symmetrical about port tube P₁ to provide equal acoustic loading to each of the two woofers. Having the end chambers coupled by the port tube through the intermediate subchamber facilitates manufacture and helps achieve a desired performance level with a thinner enclosure. Having one end of each port tube flush with a supporting intermediate wall increases the effective acoustic mass for a given port tube length.
  • An advantage of the invention is that with at least three spaced deflection minima within the passband, diaphragm displacement to produce a prescribed sound level is reduced. This feature allows use of smaller woofers that may be supported upon a relatively small baffle parallel and perpendicular to enclosure sides in an enclosure of the same volume as a prior art enclosure having larger woofers mounted on a slanted baffle.
  • Referring to FIG. 39, there is shown still another embodiment of the invention comprising cylindrical subchambers. A first cylindrical structure 101 defines subchambers 101A and 101B separated by an internal circular baffle 102 carrying woofer 103 with end port tubes 104 and 105. Cylindrical structure 101 may then be placed through the circular opening of port 112 in cylindrical structure 111 to define another subchamber formed by the region between cylindrical structure 101 and the contiguous cylindrical region of structure 111. Cylindrical structure 121 may then similarly accommodate nested structures 101 and 111 through port 122 to define still another subchamber surrounding cylindrical structures 101 and 111 and partially cylindrical. It is within the principles of the invention to form similar nesting structures of elliptical, triangular, square or other cross sections. Applying this nesting principle allows for implementing a modular building-block approach to forming enclosures, whereby a selected level of bass response may be achieved by adding completely passive subchambers to one or more basic drive units.
  • Referring to FIGS. 40A and 40B, there are shown shipping and use positions, respectively, of a variation of the embodiment of FIG. 39. Applying this nesting principle allows for making a compact portable bass system, whereby the larger, outer subchamber collapsed serve as a carrying case during transport of shipment as shown in FIG. 40A, but can be extended to define a subchamber of larger volume for better bass reproduction as shown in FIG. 40B.

Claims (15)

  1. A loudspeaker system comprising:
       a first electroacoustical transducer (12) having a vibratable diaphragm for converting an input electrical signal into a corresponding acoustic output signal,
       an enclosure,
       the enclosure being divided into first (V1), second (V2) and third (V3) subchambers by at least first (13) and second (11) dividing walls,
       the first dividing wall (13) supporting and coacting with the first electroacoustical transducer (12) to bound the first (V1) and the second (V2) subchambers,
       a first passive radiator (P1) intercoupling the first and third subchambers,
       a second passive radiator (P2,P3) intercoupling at least one of the second (V2) and third (V3) subchambers with the region outside the enclosure,
       each of the passive radiators having an acoustic mass,
       each of the subchambers having an acoustic compliance,
       the acoustic masses and the acoustic compliances being selected to establish at least three spaced frequencies in the passband of the loudspeaker system at which the deflection characteristic of the vibratable diaphragm as a function of frequency has a minimum.
  2. A loudspeaker system according to claim 1, wherein the second passive radiator (P2) intercouples the second subchamber (V2) with the region outside the enclosure, and further comprising a third passive radiator (P3) intercoupling the third subchamber (V3) with the region outside the enclosure.
  3. A loudspeaker system according to claim 1, further comprising a fourth subchamber (V₄˝) having an acoustic compliance and separated from at least one other of the subchambers by at least a third dividing wall (14˝), and a third passive radiator (P₂˝) having an acoustic mass and intercoupling the fourth subchamber (V₄˝) with at least one of the other subchambers, the acoustic masses and the acoustic compliances being selected to establish at least a fourth frequency spaced from the at least three spaced frequencies in the passband of the loudspeaker system at which the deflection characteristic of the vibratable diaphragm as a function of frequency has a minimum.
  4. A loudspeaker system according to claim 3, further comprising at least a fourth passive radiator (P₄˝) intercoupling the fourth subchamber (V₄˝) with the region outside the enclosure.
  5. A loudspeaker system according to claim 1, further comprising a third passive radiator (P2′) intercoupling the second and third subchambers (V2′,V3′).
  6. A loudspeaker system according to claim 1, wherein the second and third subchambers are end subchambers and the second passive radiator is located in the third subchamber.
  7. A loudspeaker system according to claim 6, wherein the first passive radiator (P₁vi) passes through the first subchamber (V₁vi).
  8. A loudspeaker system according to claim 6 or claim 7, wherein the second passive radiator is a port tube (P₃vi) bounded by the inside surface of a toroid of substantially elliptical cross section.
  9. A loudspeaker system according to claim 8, wherein the elliptical cross section has a major diameter corresponding substantially to the length of said port tube (P₃vi).
  10. A loudspeaker system according to claim 1, wherein the second passive radiator intercouples the second subchamber with the region outside the enclosure, and further comprising a third passive radiator intercoupling the first and second subchambers.
  11. A loudspeaker system according to claim 3, wherein the third passive radiator intercouples the second and fourth subchambers, and further comprising a fourth passive radiator intercoupling the first and fourth subchambers.
  12. A loudspeaker system according to claim 3, wherein the third passive radiator intercouples the fourth subchamber, and further comprising a fourth passive radiator intercoupling the fourth subchamber with the second subchamber.
  13. A loudspeaker system according to claim 3, wherein the first and third passive radiators and the fourth subchamber intercouple the first and third subchambers, and further comprising a fourth passive radiator intercoupling the second subchamber and the region outside the enclosure.
  14. A loudspeaker system according to claim 1, wherein at least one of the subchambers nests inside one of the other subchambers.
  15. A loudspeaker system according to claim 14, wherein said at least one and said other subchambers are relatively movable between a transport-contracted position and a use-extended position.
EP91311100A 1990-12-03 1991-11-29 Loudspeaker system having multiple subchambers Expired - Lifetime EP0489551B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US621531 1990-12-03
US07/621,531 US5092424A (en) 1990-12-03 1990-12-03 Electroacoustical transducing with at least three cascaded subchambers

Publications (3)

Publication Number Publication Date
EP0489551A2 true EP0489551A2 (en) 1992-06-10
EP0489551A3 EP0489551A3 (en) 1993-04-14
EP0489551B1 EP0489551B1 (en) 1996-05-08

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91311100A Expired - Lifetime EP0489551B1 (en) 1990-12-03 1991-11-29 Loudspeaker system having multiple subchambers

Country Status (6)

Country Link
US (1) US5092424A (en)
EP (1) EP0489551B1 (en)
JP (1) JPH07118834B2 (en)
AT (1) ATE137904T1 (en)
CA (1) CA2056566A1 (en)
DE (1) DE69119376T2 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994021092A1 (en) * 1993-03-02 1994-09-15 Srt, Inc. Fluid damped acoustic enclosure system
CN1060608C (en) * 1992-07-23 2001-01-10 户泽克俊 Loud-speak system
WO2004030402A1 (en) * 2002-09-27 2004-04-08 Sony Ericsson Mobile Communications Ab Double-resonator micro-speaker assemblies and methods for tuning the same
US6896096B2 (en) 2000-07-21 2005-05-24 B&W Loudspeakers Limited Acoustic structures
US7567680B2 (en) 2004-10-29 2009-07-28 Sony Ericsson Mobile Communications, Ab Dual-diaphragm speaker assemblies with acoustic passageways and mobile terminals including the same
US7756553B2 (en) 2007-01-05 2010-07-13 Apple Inc. Folded flex assembly for personal media device
US8126138B2 (en) 2007-01-05 2012-02-28 Apple Inc. Integrated speaker assembly for personal media device
US8306252B2 (en) 2007-01-05 2012-11-06 Apple Inc. Integrated microphone assembly for personal media device
US9066172B2 (en) 2012-09-28 2015-06-23 Apple Inc. Acoustic waveguide and computing devices using same
US9380369B2 (en) 2013-02-14 2016-06-28 Apple Inc. Microphone seal
US9608389B2 (en) 2009-02-23 2017-03-28 Apple Inc. Audio jack with included microphone

Families Citing this family (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147986A (en) * 1990-12-03 1992-09-15 Tandy Corporation Subwoofer speaker system
US5714721A (en) * 1990-12-03 1998-02-03 Bose Corporation Porting
EP0548836B1 (en) * 1991-12-20 1997-06-11 Matsushita Electric Industrial Co., Ltd. A bass reproduction speaker apparatus
GB2269959B (en) * 1992-08-19 1996-03-06 Canon Audio Ltd Sound output
US5307418A (en) * 1992-10-30 1994-04-26 Culver Electronic Sales, Inc. Center channel speaker having multiple interconnected backload amplifying chambers for surround sound stereo audio systems
US5278361A (en) * 1993-02-05 1994-01-11 Thomson Consumer Electronics, Inc. Loudspeaker system
DE4344618A1 (en) * 1993-12-24 1995-06-29 Nokia Deutschland Gmbh Double chamber bass reflex box
US5656966A (en) * 1994-03-09 1997-08-12 Cooper Industries, Inc. Turbine engine ignition exciter circuit including low voltage lockout control
US5561717A (en) * 1994-03-15 1996-10-01 American Trading And Production Corporation Loudspeaker system
AU707281B2 (en) * 1994-12-23 1999-07-08 Immersion Technology Property Limited Loudspeaker system incorporating acoustic waveguide filters and method of construction
US6223853B1 (en) 1994-12-23 2001-05-01 Graeme John Huon Loudspeaker system incorporating acoustic waveguide filters and method of construction
US5471019A (en) * 1994-12-29 1995-11-28 Sounds Resources, Inc. Multiple chamber loudspeaker system
US5659157A (en) * 1995-03-21 1997-08-19 Shulte; Daniel W. 7th order acoustic speaker
US5550921A (en) * 1995-05-15 1996-08-27 Sparkomatic Stereo sound source for portable computer
US5917923A (en) * 1995-05-18 1999-06-29 Bose Corporation Satellitic compact electroacoustical transducing
US6118876A (en) * 1995-09-07 2000-09-12 Rep Investment Limited Liability Company Surround sound speaker system for improved spatial effects
US5930370A (en) * 1995-09-07 1999-07-27 Rep Investment Limited Liability In-home theater surround sound speaker system
US5708719A (en) * 1995-09-07 1998-01-13 Rep Investment Limited Liability Company In-home theater surround sound speaker system
US5696359A (en) * 1995-11-13 1997-12-09 Lucent Technologies Inc. Portable loudspeaker/directional microphone peripheral
US5749433A (en) * 1996-02-13 1998-05-12 Jackson; Michael Massline loudspeaker enclosure
JP3454005B2 (en) * 1996-04-03 2003-10-06 松下電器産業株式会社 Speaker device and sound reproducing device
JPH10126875A (en) * 1996-10-16 1998-05-15 Matsushita Electric Ind Co Ltd Speaker device
US5792999A (en) * 1997-01-23 1998-08-11 Bose Corporation Noise attenuating in ported enclosure
US6263083B1 (en) 1997-04-11 2001-07-17 The Regents Of The University Of Michigan Directional tone color loudspeaker
US5872339A (en) * 1997-08-28 1999-02-16 Hanson; Charles Anthony High performance loudspeaker system
JP3141834B2 (en) * 1997-12-26 2001-03-07 株式会社村田製作所 Speaker
US6953886B1 (en) 1998-06-17 2005-10-11 Looney Productions, Llc Media organizer and entertainment center
US6704426B2 (en) 1999-03-02 2004-03-09 American Technology Corporation Loudspeaker system
US6169811B1 (en) * 1999-03-02 2001-01-02 American Technology Corporation Bandpass loudspeaker system
US6389146B1 (en) * 2000-02-17 2002-05-14 American Technology Corporation Acoustically asymmetric bandpass loudspeaker with multiple acoustic filters
US6493455B1 (en) * 1999-06-03 2002-12-10 Dennis A. Tracy Subwoofer assembly
US6513624B2 (en) 2000-02-03 2003-02-04 C. Ronald Coffin Loudspeaker enclosure
US20070003076A1 (en) * 2000-02-17 2007-01-04 American Technology Corporation Bandpass woofer enclosure with multiple acoustic filters
US7103193B2 (en) * 2000-09-15 2006-09-05 American Technology Corporation Bandpass woofer enclosure with multiple acoustic fibers
US6431309B1 (en) * 2000-04-14 2002-08-13 C. Ronald Coffin Loudspeaker system
US6862360B2 (en) * 2001-04-19 2005-03-01 Jen-Hui Tsai Speaker system
US7962482B2 (en) 2001-05-16 2011-06-14 Pandora Media, Inc. Methods and systems for utilizing contextual feedback to generate and modify playlists
US7551749B2 (en) * 2002-08-23 2009-06-23 Bose Corporation Baffle vibration reducing
US6985593B2 (en) * 2002-08-23 2006-01-10 Bose Corporation Baffle vibration reducing
AU2002368266A1 (en) * 2002-10-10 2004-05-04 Nokia Corporation A sound generating apparatus, a mobile electric device and a system for generating sound
US7162049B2 (en) * 2003-01-07 2007-01-09 Britannia Investment Corporation Ported loudspeaker system and method with reduced air turbulence, bipolar radiation pattern and novel appearance
US7087072B2 (en) * 2003-01-22 2006-08-08 Cardia, Inc. Articulated center post
US7207413B2 (en) * 2003-06-02 2007-04-24 Tbi Audio Systems Llc Closed loop embedded audio transmission line technology for loudspeaker enclosures and systems
US7751579B2 (en) * 2003-06-13 2010-07-06 Etymotic Research, Inc. Acoustically transparent debris barrier for audio transducers
US7350618B2 (en) * 2005-04-01 2008-04-01 Creative Technology Ltd Multimedia speaker product
FI122126B (en) * 2005-10-05 2011-08-31 Genelec Oy Refleksikaiutinrakenne
US7749238B2 (en) * 2006-06-19 2010-07-06 Cardia, Inc. Occlusion device with flexible polymeric connector
US7691115B2 (en) * 2006-06-19 2010-04-06 Cardia, Inc. Occlusion device with flexible fabric connector
US7927351B2 (en) * 2006-06-19 2011-04-19 Cardia, Inc. Occlusion device with flexible wire connector
US7972361B2 (en) * 2006-06-19 2011-07-05 Cardia, Inc. Occlusion device with flexible spring connector
US20080149417A1 (en) * 2006-12-21 2008-06-26 Apple Computer, Inc. Acoustic assembly for personal media device
US20080167682A1 (en) * 2007-01-09 2008-07-10 Cardia, Inc. Bioabsorbable occlusion device
US7578367B2 (en) * 2007-03-07 2009-08-25 Foxconn Technology Co., Ltd. Speaker set and electronic product incorporating the same
US7578368B2 (en) * 2007-03-07 2009-08-25 Foxconn Technology Co., Ltd. Speaker set for electronic product
CN101394681B (en) * 2007-09-21 2014-11-26 索尼(中国)有限公司 Split type electronic device
US8284977B2 (en) * 2008-01-24 2012-10-09 Creative Technology Ltd Multi chamber ported stereo speaker
CN101500185A (en) * 2008-01-30 2009-08-05 深圳富泰宏精密工业有限公司 Loudspeaker assembly
US8180076B2 (en) * 2008-07-31 2012-05-15 Bose Corporation System and method for reducing baffle vibration
US8238595B2 (en) * 2009-01-07 2012-08-07 Hewlett-Packard Development Company, L.P. Speaker component for a portable electronic device
CN101711005B (en) * 2009-11-17 2013-04-24 南京大学 Device for improving outgoing loudspeaker responses
WO2011076291A1 (en) * 2009-12-24 2011-06-30 Nokia Corporation An apparatus for use in portable devices
US8577073B2 (en) 2010-05-12 2013-11-05 Dennis A. Tracy Rectangular wall mounted speaker assembly
US8430201B1 (en) * 2010-09-09 2013-04-30 Michael Weidner Speaker enclosure
CN102630066B (en) * 2012-02-23 2014-10-08 深圳创维-Rgb电子有限公司 Eight-order band-pass speaker box and television
CN102638750A (en) * 2012-04-09 2012-08-15 南京大学 Design method of loudspeaker for active noise control of power transformer
US11076220B2 (en) 2012-05-31 2021-07-27 VUE Audiotechnik LLC Loudspeaker system
US9173018B2 (en) * 2012-06-27 2015-10-27 Bose Corporation Acoustic filter
US9247342B2 (en) 2013-05-14 2016-01-26 James J. Croft, III Loudspeaker enclosure system with signal processor for enhanced perception of low frequency output
TWI531248B (en) * 2013-08-23 2016-04-21 宏碁股份有限公司 Sound box structure
US9473848B2 (en) 2013-09-10 2016-10-18 Bose Corporation Transmission line loudspeaker
US9049517B2 (en) 2013-09-10 2015-06-02 Bose Corporation Transmission line loudspeaker
TWI568276B (en) * 2014-01-06 2017-01-21 緯創資通股份有限公司 Loudspeaker module and thin electronic device haing the same
CN103826183B (en) * 2014-02-24 2019-07-26 东莞凤合凰电声科技有限公司 A kind of band general formula woofer and its method of adjustment
US10441258B2 (en) 2017-06-16 2019-10-15 Cardia, Inc. Uncoupled LAA device
US20190052942A1 (en) 2017-08-08 2019-02-14 Srdjan Pavelic Portable solar powered smart speaker system
CN107820178A (en) * 2017-11-24 2018-03-20 苏州逸巛声学科技有限公司 A kind of receiver
US20210105556A1 (en) * 2019-10-08 2021-04-08 Soniphi Llc Systems & Methods For Expanding Sensation Using Isobaric Chambers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142353A (en) * 1962-10-25 1964-07-28 Carmine V Todisco Speaker enclosure
FR2145050A5 (en) * 1971-07-07 1973-02-16 Wattson Etude Exploit
US4142603A (en) * 1976-11-22 1979-03-06 Johnson Rubein V Adjustable speaker cabinet
FR2507423A1 (en) * 1981-06-04 1982-12-10 Mulidine Sarl Acoustic enclosure for hi=fi loudspeaker - has three linked chambers ensuring resonant frequency is above normal operating range
US4756382A (en) * 1987-03-02 1988-07-12 Hudson Iii Joseph L Loudspeaker having enhanced response at bass frequencies
DE4019645A1 (en) * 1989-06-20 1991-01-03 Pioneer Electronic Corp Loudspeaker with several loudspeakers - has several loudspeaker housing in common casing, each housing with preset vol.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688864A (en) * 1970-04-16 1972-09-05 Talbot American Corp Infinite dynamic damping loudspeaker systems
US3918551A (en) * 1974-10-21 1975-11-11 Rizo Patron Alfonso Speaker system
US4549631A (en) * 1983-10-24 1985-10-29 Bose Corporation Multiple porting loudspeaker systems
JPS62178680U (en) * 1986-05-01 1987-11-13
JPH0644235Y2 (en) * 1988-03-14 1994-11-14 株式会社ケンウッド Speaker system for bass reproduction
US4875546A (en) * 1988-06-02 1989-10-24 Teledyne Industries, Inc. Loudspeaker with acoustic band-pass filter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3142353A (en) * 1962-10-25 1964-07-28 Carmine V Todisco Speaker enclosure
FR2145050A5 (en) * 1971-07-07 1973-02-16 Wattson Etude Exploit
US4142603A (en) * 1976-11-22 1979-03-06 Johnson Rubein V Adjustable speaker cabinet
FR2507423A1 (en) * 1981-06-04 1982-12-10 Mulidine Sarl Acoustic enclosure for hi=fi loudspeaker - has three linked chambers ensuring resonant frequency is above normal operating range
US4756382A (en) * 1987-03-02 1988-07-12 Hudson Iii Joseph L Loudspeaker having enhanced response at bass frequencies
DE4019645A1 (en) * 1989-06-20 1991-01-03 Pioneer Electronic Corp Loudspeaker with several loudspeakers - has several loudspeaker housing in common casing, each housing with preset vol.

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060608C (en) * 1992-07-23 2001-01-10 户泽克俊 Loud-speak system
AU682347B2 (en) * 1993-03-02 1997-10-02 Srt, Inc. Fluid damped acoustic enclosure system
WO1994021092A1 (en) * 1993-03-02 1994-09-15 Srt, Inc. Fluid damped acoustic enclosure system
US6896096B2 (en) 2000-07-21 2005-05-24 B&W Loudspeakers Limited Acoustic structures
US7840023B2 (en) 2002-09-27 2010-11-23 Sony Ericsson Mobile Communications Ab Double-resonator micro-speaker assemblies and methods for tuning the same
US7123736B2 (en) 2002-09-27 2006-10-17 Sony Ericsson Mobile Communications Ab Double-resonator micro-speaker assemblies and methods for tuning the same
WO2004030402A1 (en) * 2002-09-27 2004-04-08 Sony Ericsson Mobile Communications Ab Double-resonator micro-speaker assemblies and methods for tuning the same
US7567680B2 (en) 2004-10-29 2009-07-28 Sony Ericsson Mobile Communications, Ab Dual-diaphragm speaker assemblies with acoustic passageways and mobile terminals including the same
US7756553B2 (en) 2007-01-05 2010-07-13 Apple Inc. Folded flex assembly for personal media device
US8126138B2 (en) 2007-01-05 2012-02-28 Apple Inc. Integrated speaker assembly for personal media device
US8306252B2 (en) 2007-01-05 2012-11-06 Apple Inc. Integrated microphone assembly for personal media device
US8649506B2 (en) 2007-01-05 2014-02-11 Apple Inc. Integrated speaker assembly for personal media device
US9866931B2 (en) 2007-01-05 2018-01-09 Apple Inc. Integrated speaker assembly for personal media device
US9608389B2 (en) 2009-02-23 2017-03-28 Apple Inc. Audio jack with included microphone
US9066172B2 (en) 2012-09-28 2015-06-23 Apple Inc. Acoustic waveguide and computing devices using same
US9380369B2 (en) 2013-02-14 2016-06-28 Apple Inc. Microphone seal

Also Published As

Publication number Publication date
US5092424A (en) 1992-03-03
CA2056566A1 (en) 1992-06-04
JPH07118834B2 (en) 1995-12-18
JPH0514988A (en) 1993-01-22
DE69119376T2 (en) 1996-11-14
EP0489551B1 (en) 1996-05-08
DE69119376D1 (en) 1996-06-13
EP0489551A3 (en) 1993-04-14
ATE137904T1 (en) 1996-05-15

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